Both magPIE and Subtitle Workshop support the export of captions to W3C's TimedText (Flash), SMIL/QTtext (Quick-time) and ASX/SAMI (Windows Media). For Subtitle Workshop you need the TimedText output script (available from Naomi Spirit). Captionate, (intended for FLV video) can export to W3C's TimedText, though it can also save captions as metadata.

Other Resources

Subsandcaps: A free online resource to help people find closed captioning providers. At www.subsandcaps.com users can find and compare services from multiple, competing companies, review rates, and reserve their projects in less than a minute.